| Autor: |
Anja, Rüther, Marcel, Pfeifer, Víctor A, Lórenz-Fonfría, Steffen, Lüdeke |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Chirality. 26(9) |
| ISSN: |
1520-636X |
| Popis: |
Changes in vibrational circular dichroism (VCD) were recorded on-line during a chemical reaction. The chiral complex nickel-(-)-sparteine chloride was hydrolyzed to free (-)-sparteine base in a biphasic system of sodium hydroxide solution and chloroform (CHCl(3)). Infrared (IR) and VCD spectra were iteratively recorded after pumping a sample from the CHCl(3) phase through a lab-built VCD spectrometer equipped with a tunable mid-IR quantum cascade laser light source, which allows for VCD measurements even in the presence of strongly absorbing backgrounds. Time-dependent VCD spectra were analyzed by singular value decomposition and global exponential fitting. Spectral features corresponding to the complex and free (-)-sparteine could be clearly identified in the fitted amplitude spectrum, which was associated with an exponential decay with an apparent time constant of 127 min (t(½) = 88 min). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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